OS 2.0 MIDI implementation and another question

OS 2.0 MIDI implementation and another question
« on: December 05, 2021, 12:57:36 PM »
Is there an updated MIDI spec for OS 2.0? I couldn’t see anything for chord mode or poly unison in the chart.

Also, what is NRPN 55-64 (Unison Note) for? It’s not the voice count.